Blade attaching means



Feb. 2, 1954 H. E. M CRERY BLADE ATTACHING MEANS Filed March 19, 1947Patented Feb. 2, 1954 BLADE ATTACHING MEANS Harold E. McCrery, Dayton,Ohio, assignor, by

mesne assignments, to Master Vibrator Company, Dayton, Ohio, acorporation of Ohio Application March 19, 1947, Serial No. 735,627

This invention pertains to surfacing implements, and more particularlyto an apparatus having progressive wiping engagement over the surfaceupon which it is operated.

While for illustrative purposes, the invention is herein shown anddescribed as embodied in a power .operated concrete troweling machine orfloat for finishing concrete surfaces, of the type shown and describedin the copending application of Harold S. Boulton, Serial No. 721,574,filed January 11, 1947, now Patent No. 2,605,683, it is equallyapplicable to other types of apparatus or to hand troweling blades. Bysubstitution of suitable work engaging elements, the presentconstruction may be used in assembling scrubbing brushes, abrasive worksurfaces, or soft polishing surfaces.

The object of the present invention is to improve the construction ofsurface treating equipment whereby it may not only be economicallyconstructed, but will be more efficient in use, uniform in action, oflonger life, and be unlikely to get out of repair.

A further object of the invention is to minimize the time and laborrequired in the manu-,=-;

' the mounting of such surface treating implements;

A further and important object of the invention is to minimize the costof repair or replacement of surface treating equipment of the presenttype.

A further object of the invention is to provide a mounting for surfacetreating implements embodying the advantageous structural features, theinherent meritorious characteristics and the mode of construction hereinset forth, or their equivalents.

With the above primary and other incidental objects in view as will morefully appear in the specification, the invention intended to beprotected by Letters Patent consists of the features of construction,the parts and combinations thereof, and the mode of operation, ashereinafter described or illustrated in the accompanying drawings, ortheir equivalents.

In the accompanying drawings, wherein is shown the preferred, butobviously not necessarily the only form of embodiment of the invention,

Fig. 1 is a perspective view of a power driven rotary concrete surfacingmachine in which the present invention is embodied.

Claims. (01. 94-45) Fig. 2 is a fragmentary perspective view, partly insection, of the blade mounting assembly.

1 Fig. 3 is a fragmentary perspective view, partly in section, of ablade assembly with the mounting bar in place.

Fig. 4 is a perspective view of a manual troweling blade embodying thepresent invention.

Figs. 5 and 6 are fragmentary perspective Views, similar to Figs. 2 and3, showing a modified form of construction.

Like parts are indicated by similar characters of reference throughoutthe several views.

The present disclosure is an improvement and :further development ofthat shown and described in my pending application Serial No. 681,711,filed July 6, 1946, now Patent No. 2,594,331, and a further improvementof the invention claimed in the aforementioned Boulton application, ofwhich pertinent portions are herein shown and described for illustrativepurposes, but which, per se, form no part of the instant invention whichis directed to the means of assembling the surfacing elements to thepower driven apparatus of the above applications, or to appropriatehandles for manual operation.

Referring to the accompanying drawing, the

rotary surfacing machine in Fig. 1, comprises a rotary base I from whichradiate a plurality of reversible sweeps 2-2, surrounded by a guard ring3 upon which the outer ends of the sweeps 2 are pivoted. Located inaxial relation above the revoluble base I is a gear housing 4 surmountedby a driving motor 5. The motor shown in Fig. 1 is a conventionalexplosive engine or hydrocarbon motor. An electric motor may besubstituted for the explosive engine 5. A driving pulley 6 of the motor,of whatever type, is connected by V belt with a driven pulley 8 of thegear driving mechanism within the housing 4. A handle 9 extends upwardlyand radially from the housing 4 for controlling and guiding the machine.Manually operated control devices It) mounted on the handle 9 withineasy reach of the operator, are connected through the handle shaft withthe actuating motor 5.

The power transmission, driving, and adjusting features of the instantdisclosure are substantially those of the copending applicationsaforementioned, to which reference is made.

Other types of surfacing elements may be substituted for the trowelingplates l8|9, thereby converting the present power driven apparatus fortypes of work other than concrete surfacing.

The instant sweeps 2 comprise vertically disposed angle bars ll havinglaterally projecting marginal flanges [2. To the inner ends of the anglebars H are welded short rectangular bars [3 which extend beyond theangle bars as cylindrical trunnion shafts I4 aligned with the centerline of the angle bars H. At the opposite ends of the angle bars llthere are welded thereto in axial alignment with the trunnions l4rectangular collars $16 within which engage :ltrunnion studs l? weldedto the surrounding guard ring? The web portions of the angle bars H aredisposed substantially coincident with the radii'df the horizontal axisabout which the sweepszsar'e adjustable. Attached to the bottom flangeof the bars II are surface platesior 'fioatsf8"which are comparativelywide and pertain-thermal concrete surfacing operations of distributingand leveling the concrete material. Addition'al flanges similar to theflanges [2 project fromthe top of the angle bars H in a directionoppb's'iteto flanges l2, finishing or secondary plates 19 being securedto suchadditional flanges. The construction Ofthe -finiSh-ingmabhineshown in Fig. -1 is {such thatthe barS l i may berotated about theirtrunnions through 180 degrees to bring either the plates it; or is intocontact engagement withthe surface being treated.

v rrie reregemg ner descriptidn of the'mach'ine "of F-ig'. l is; simplyfor the purpose of illustrating "one type dfm'ach-ine' in which" thesubjectmatter of the instant invention may be"ut'ilized,"s'uc'h "machineforming no part fof the presentinvention and "to whicnthepresent'inventionisinno To connect the blades to the-flahges l2 each "blade isprdvi'dd with a longitudinal "extending channel member'ee, Secured totheblade "by spot "Welding or-other means at longitudinally "sp acedintervals. 'The channel memberflfi i'sfo'rmed with nausea portion 2 ithe "bottom-thereof there- "by providing longitudinally "extending beads22 'onthe bottom'of the channelt'arrd'atthe'edges fthemonfwmcn have*contact engagement with he fi Y At relatively "spacedintervals"throughout the oi the channel, the raised portion-21 is h h'ted'byjdepr'essionsfiit. "SdchdepreSSions :jzs *fiusnwith the b ottornfor the beads ZZahd the "surface bft'he bla'de when the chan- "n'el isplaced'there'on. u I v irnerchenn'e is secureaiite the blade by"s'p'btwelding br riveting, the lattachmentibeihg made coincideiitwithTthedepressions 23. The depres- 'fsidn's are "pr vide ror this purposejsi'nce "it is impractical, "1r not 'iin'ptis'sible, t interconnecttheraisd'poi'tifinsl'l ah'd'tfie blafie. fLocatedwithihthe c anneijzs anrestifiguptn .theraisedl'portidns :1 thereof, isa'bar M'wliihinterconnects the blade ass ernb'ly'lafll 'vvith then-asses T2.'of lithevanglebars fl. The 1156;- ftibns :21 of I the manner, are raised toprovidesup- Qport fori the bar 2 3 in spaced'relatioh with the Bottom1dr the channel; Suchcha'nnls arearawn .vvith a's liglit radius inthelcdrner's thereoi 'tvhich, wer'e 'it iibt for'the .esrist ence (iflilieraised portions 2 i, would prevent'solid well supported seatfingengagement of arectangularbar therewithiil. Shbuldan"'atterript"beima'deto seati'the bar 'cn'th'e' bottom' orscon'vemionnchannermember,'the"longitudinal"edges of the "bar mustbereduced to conformity with 'the ra'dius oi the channel. This is quitediflicult from a practical "standpoint "since the "channels are 'notuniform andinterchangeabilitybfparts is' practically impossible. Toovercome thisfiifiicult and expensive-operation; the presentbhannels 2eare initially formed with the raised portions 2| therein upon which therectangular bar 24 may rest in elevated relation with the extreme bottomof the channel. The elevation is just sufiicient to support the loweredge of the bar 24 above the bend in the channel. With this constructionthe bar 24 is located within the vertical limits of the parallel :isi'dme b rs of'the channel 'aiidih elevated relatitin with the ar'cuatecorners interciinhecting the it; vertical and horizontal portions of thechannel.

This method of construction is well adapted to m'a ssiproduction andassembly, since the parts are all interchangeable. Furthermore the bar24 firmlysuppbited since the greater portion of ii *itnepo m eiffiiliechannel is raised to be in supporting engagement with the bar.

-1A ='-series sofiisransversely aligned holes 25 are located-in the sideportions of the channel, in registr with the transverse holes 25 in thebar. The bar 24 is secured in position within the chaneleven by''thebolts "2'1 avhich pass'through the 'nsv'er'sely aligned neie's z 5.arid- 215 the cnan- =-iie1 and barres eetivery. v

There is also-provided in 'the top "surfaceeof the pares a seriesfofvertical holes '28 which are tapped'to 'receiv'e' tr-ie bolts 2'9withwhichthe a'sstemmed bar aeeblade a e s'ecur-edvto the flanges i 2'of 'the' ariglebars =4 r-otheriearriers.

I "The present-assembly. is equally?- applicable'i'to 30 "othercarriersats for eicaniplea han'd trowel as shown in Fig. v -1n"' placeselfsecuring ith :b'ar i andattabhedahannel and bladetothe flange "$2 ofthe angle bars 'l of the lpower Edrivent'machin'e," it 'rnay beiattached to a handleiafl 'having fls' longitudinally "extendingprojections 31 "with which-the bolts zl "are engage'd.

The angle bars II or handle 1 30 iarescarrier members, 'whichgfiogetherWithathei-bar 2dfpro- 7 wide a carrier fdr-fthe blade assemblycomprising eil the bla'de sor 1 9- ogether withtne channei izu which issecured'there-to.

N'o't drfly shes "the present s'i'irt-i ctur'e permit rapid andefficient assembly 6f" rewslm'g blades, -but the riun rberkif-fneessarymanufacturing op- 45 'ereition'sis maten e ream a. The-clia nlsitere-preformed and 'need only be "cutjto 't edesired length and drilled.The bars stare-used *esitney are attained'rromthemins with-tin aciittihg; drilling "and tapping operation" required. Theonlyother.manufacturing operation rem-tired is the wldmglorl riveting ofth'eJhan'nel's 29 to eble s In Figs. 5 and 6 "there is shown an alternativeform of :constructi-on in which the samelobjecchannel 20. J r *In' thisembodiment efQthe +invention,-a:standiard channeli-form-32directlyysecured to-the blade by means of the large head rivets 33. :Therivetiheads are FOf Qsuihcient heighth *to accom- .plisir theesamezpurpose asfthe elevations 2 I a-irr the channleilaine tosupport:the'inountingbar' fld zinielevateii relatmnmi-thrthe bottonrdftheeehanwe 34 on the under SiHe dithe bIaiie"pfotiuciii .tivesareobtai-i'ied, without :the use Jo f a special a substantially smoothuninterrupted surface thereon.

As shown in the drawing, the bar 24 when placed within the channel 32rests upon and is supported by the rivet heads 33 in elevated spacedrelation with the bottom of the channel. The bar is secured within thechannel in the same manner as previously secured.

The present construction also permits efiicient and economicalreplacement of blades. Due to the continual movement of the blades overrough and abrasive surfaces, they of course rapidly show signs of wear,and within a short time become unsuitable for further use. To replaceworn blades it is only necessary to remove the three bolts 21, removethe worn blade and substitute a new one therefor. Because of the lowcost production of the blade and channel assembly, the replacement bladeis of low cost and easily obtainable. It should be noted that it isunnecessary to discard the blade mounting means, whether of themechanical or hand type, when the blade becomes worn, but only the bladeis replaced.

The present blade assembly is highly resistant to longitudinal flexing,since it is reinforced by the channel 20. Yet this highly desirablerigidity is achieved at very little additional expense and with verylittle additional weight or bulk. This is an important feature whetherthe blade is to form a part of a power driven machine, or merely a handtrowel.

From the above description it will be apparent that there is thusprovided a device of the character described possessing the particularfeatures of advantage before enumerated as desirable, but whichobviously is susceptible of modification in its form, proportions,detail construction and arrangement of parts without departing from theprinciple involved or sacrificing any of its advantages.

While in order to comply with the statute the invention has beendescribed in language more or less specific as to structural features,it is to be understood that the invention is not limited to the specificfeatures shown, but that the means and construction herein disclosedcomprise the preferred form of several modes of putting the inventioninto eifect, and the invention is therefore claimed in any of its formsor modifications Within the legitimate and valid scope of the appendedclaims.

Having thus described my invention, I claim:

1. An implement for troweling cementitious surfaces of the type whereina troweling blade is attached to a traveling carrier member, including alongitudinally extending channel member having curved corners secured tothe blade, elevated portions in the bottom of said channel, saidportions being in elevated spaced relation with the blade, and inwardlyspaced relative to the sides of said channel, mounting means thereforcomprising a rectangular bar seated within the channel upon the elevatedportions thereof, and in contacting relation with the sides of saidchannel, and means for detachably interconnecting the carrier member andthe channel with said interposed mounting means.

2. An implement for surfacing floors of the type wherein a work tool isattached to a traveling carrier member, including a channel memberhaving curved corners, a series of spaced rivets interconnectin thechannel member and work tool, enlarged heads on said rivets providing aseries of spaced supporting areas in elevated relation with the bottomof the channel member, a coupling member having a fiat lower faceengageable within the channel member in contacting relation with theside walls of said channel and seated upon the elevated supporting areasin elevated spaced relation with the bottom of said channel, andengaging means detachably interconnecting the coupling member with thecarrier member and with the channel member.

3. An implement for troweling cementitious surfaces of the type whereina troweling blade is attached to a traveling carrier member, includin alongitudinally extending channel member having curved corners secured tothe blade, elevated portions in the bottom of said channel, saidportions being in elevated spaced relation with the blade, and inwardlyspaced relative to the sides of said channel, mounting means thereforcomprising a bar having a flat lower face seated within the channel uponthe elevated portions thereof, and in contacting relation with the sidesof said channel, and means for detachably interconnecting the carriermember and the channel with said interposed mounting means.

4. An implement for troweling cementitious surfaces of the type whereina troweling blade is attached to a carrier, including a longitudinallyextended channel member having curved corners and secured to the blade,elevated portions in the bottom of said channel, said portions being inspaced relation to the blade and inwardly spaced relative to the sidesof the channel, said carrier having a flat lower face seated within thechannel upon the elevated portion thereof and in contacting relationwith the sides of said channel, and means detachably interconnecting thecarrier and the channel.

5. An implement for troweling cementitious surfaces of the type whereina troweling blade is attached to a traveling carrier member, including alongitudinally extending channel member r having curved corners securedto the blade, an

elevated portion in the bottom of said channel, said portion being inelevated spaced relation with the blade, and inwardly spaced relative tothe said sides of said channel, a series of spaced depressionsinterrupting said elevated portion and secured to said blade, mountingmeans therefor comprising a bar seated within the channel upon theelevated portion thereof, and in contacting relation with the sides ofsaid channel, and means for detachably interconnecting the carriermember and the channel with said interposed mounting means.

HAROLD E. MCCRERY.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 92,506 Ault July 13, 1869 425,110 Smith Apr. 8, 1890 653,795Ecke July 17, 1900 838,608 Curwen Dec. 18, 1906 961,302 Linville June14, 1910 1,121,281 Olson Dec. 15, 1914 1,501,192 Severns July 15, 19242,048,529 Williams July 21, 1936 2,083,400 Rose et al. June 8, 19372,392,932 Macbeth Jan. 15, 1946

